Rockman Battle & Fighters is a Mega Man Boss Rush game where you can play as a few characters from the Rockman / Mega Man franchise. Each mode consists of 6 bosses with their own weaknesses and then 2 final bosses.
Overall I thought it was very well done for what it is. They bring back bosses from many of the early games with added moves and abilities. Each character was fun to play as. Music consists of decent, though stripped-down versions of well-known songs from the franchise. Graphics are pretty good for a portable system.
I believe this is a full playthrough, but I couldn’t read a lot of it, so I don’t really know.